At a time when some doubt the benefits of cooperation between the United States and China, this visit is also a chance to demonstrate a simple truth.

正当有人怀疑美中两国间的合作是否有利的时候展开的此次访问，也提供了展示一个简单事实的机会。

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The EU stressed, however, that it plans to continue to promote its strategic partnership with Beijing at a time when the world's financial situation calls for close cooperation.

但是欧盟强调说，在世界金融局势需要加强合作之际，它将继续谋求和北京的战略伙伴关系。

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Use the means of infinite repeated game discuss the competition and cooperation conspiracy between the banks when they will effect each other at long period of time.

在无限重复博弈的框架中，分析了银行为取得好的收益而共谋确定存款利率的问题。

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At a time when some doubt the benefits of cooperation between the United States and China, this visit is also a chance to demonstrate a simple truth.

WHITEHOUSE: China State Visit Arrival Ceremony

To the contrary, China is building long-term trade relations with Africa that should help open up opportunities for trilateral cooperation, especially at a time when both Africa and the United States will be seeking to improve trade cooperation with Asia.

FORBES: Africa And Obama: What The Continent Should Do In His Second Term

The shooting in the eastern Wardak province was the latest in a series of insider attacks against coalition and Afghan forces that have threatened to undermine their alliance at a time when cooperation would aid the planned handover of security responsibility to local forces next year.

NPR: Insider Attack Kills 2 US Troops, 2 Afghans